DL1634
DL1634 (Delta Air Lines) is a multi-stop service on 9 routes, busiest Colorado Springs to Atlanta. Of 576 departures recorded from October 2024 to July 2026, 84.5% left on time, according to the US BTS.
- On-time departures84.5%of 576 flights
- Average delay9.3 min
- July 202630▼ 40.0%vs July 2025
- Cancelled1.2%
- Legs flown under this number9
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 26 | 30 | ▲ 15.4% |
| February | 28 | 28 | 0.0% |
| March | 31 | 31 | 0.0% |
| April | 30 | 30 | 0.0% |
| May | 31 | 31 | 0.0% |
| June | 46 | 30 | ▼ 34.8% |
| July | 50 | 30 | ▼ 40.0% |
| August | 18 | – | – |
| September | 17 | – | – |
| October | 4 | – | in progress |
| November | 22 | – | – |
| December | 10 | – | – |
| Year to date (Jan–Jul) | 242 | 210 | ▼ 13.2% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 83.3% | 86.7% | ▲ 4.0% |
| February | 82.1% | 82.1% | 0.0% |
| March | 93.6% | 85.7% | ▼ 8.4% |
| April | 90.0% | 90.0% | 0.0% |
| May | 90.3% | 87.1% | ▼ 3.6% |
| June | 84.4% | 53.3% | ▼ 36.8% |
| July | 88.0% | 70.0% | ▼ 20.5% |
| August | 94.4% | – | – |
| September | 52.9% | – | – |
| October | 100.0% | – | in progress |
| November | 100.0% | – | – |
| December | 55.6% | – | – |
| Year-to-date average (Jan–Jul) | 87.4% | 79.3% | ▼ 9.3% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 3 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 3 | 3 | 0.0% |
according to the US BTS · October 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 98.8% 569
- Cancelled 1.2% 7
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| COS ATL City of Colorado Springs Municipal Airport – Hartsfield Jackson Atlanta International Airport | 1,903 | 12.7 min | 90.7% | 206 |
| OGG LAX Kahului International Airport – Los Angeles International Airport | 3,996 | 3.4 min | 87.4% | 122 |
| BNA ATL Nashville International Airport – Hartsfield Jackson Atlanta International Airport | 344 | -0.9 min | 86.0% | 58 |
| LAX ORD Los Angeles International Airport – Chicago O'Hare International Airport | 2,802 | 29.0 min | 63.0% | 54 |
| ATL BNA Hartsfield Jackson Atlanta International Airport – Nashville International Airport | 344 | 3.4 min | 87.8% | 49 |
| FLL CVG Fort Lauderdale Hollywood International Airport – Cincinnati Northern Kentucky International Airport | 1,503 | 6.1 min | 77.4% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 30 | 30 | 96.7% | 0 |
| December 2024 | 3 | 3 | 100.0% | 0 |
| January 2025 | 26 | 24 | 83.3% | 2 |
| February 2025 | 28 | 28 | 82.1% | 0 |
| March 2025 | 31 | 31 | 93.6% | 0 |
| April 2025 | 30 | 30 | 90.0% | 0 |
| May 2025 | 31 | 31 | 90.3% | 0 |
| June 2025 | 46 | 45 | 84.4% | 1 |
| July 2025 | 50 | 50 | 88.0% | 0 |
| August 2025 | 18 | 18 | 94.4% | 0 |
| September 2025 | 17 | 17 | 52.9% | 0 |
| October 2025 | 4 | 4 | 100.0% | 0 |
| November 2025 | 22 | 22 | 100.0% | 0 |
| December 2025 | 10 | 9 | 55.6% | 1 |
| January 2026 | 30 | 30 | 86.7% | 0 |
| February 2026 | 28 | 28 | 82.1% | 0 |
| March 2026 | 31 | 28 | 85.7% | 3 |
| April 2026 | 30 | 30 | 90.0% | 0 |
| May 2026 | 31 | 31 | 87.1% | 0 |
| June 2026 | 30 | 30 | 53.3% | 0 |
| July 2026 | 30 | 30 | 70.0% | 0 |